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Old 09-19-2017, 01:42 AM   #1
XTR
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Member#: 474113
Join Date: Sep 2017
Vehicle:
06 OB XT

Question Sudden AFR Change O6 OBXT Stock

Daily Driver 06 OBXT 125k miles. Bone stock except for K/N filter.
Running 91 straight gas no ethanol.
My AFR using the basic Torque app normally reads somewhere between 14-15.5, sometimes 16.25.. No idea how accurate the AFR reading truly is,....

Today AFR pretty much sticking to 17-17.45... When boost kicks in, the AFR drops to low of 13ish depending on throttle position... No WOT, just cruise controlling the highway at 71 mph.

Ambient temp cooler, but I`ve driven in 50 deg F before without a drastic change in AFR from warmer temps..

Coolant temps the same.. 185 +-3

Runs good, smooth.. Much better MPG... Best mpg on this trip in the past is consistently 20-21 mpg. Same trip, same driving habits today got me 22.7 mpg. And today I was fully loaded with camping gear,78" load bars, with a mountain bike acting as a brake on the roof rack..

One thing I did notice though, from driving the same route repeatedly the last few months... Accelerating with cruise from 45-60 used to kick in really hard, fast acceleration.... Today, somewhat smoother/slower...

Thoughts??? I know just enough to be dangerous.........
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Old 09-19-2017, 11:04 AM   #2
WannaBJDM
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Member#: 474789
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Maybe you have a vacuum leak somewhere thats pulling in more air which is showing your AFR is leaner? I wouldn't recommend boosting in lean conditions... very dangerous
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Old 09-19-2017, 02:36 PM   #3
XTR
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Member#: 474113
Join Date: Sep 2017
Vehicle:
06 OB XT

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Derp... figured it out, last time I filled up I bumped fuel type and changed to CNG. Whew!!
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